All corrugated transfer file

Abstract

In a collapsible filing box comprising a sleeve containing a drawer, the sleeve is reinforced so as to require no internal liner and no support from the drawer. To this end, flaps at the front end of the side panels of the sleeve are folded upon themselves to form reinforcing pillars within the mouth of the sleeve and supporting the top panel of the sleeve, and flaps closing the rear of the sleeve extend between the bottom and top panels of the sleeve to provide further support for the latter.

What I claim as my invention is: 
     
       1. A collapsible box file comprising a sleeve portion and a drawer insertable within the sleeve portion wherein both the drawer and the sleeve portion are formed by fold corrugated cardboard blanks, the blank forming the sleeve portion having opposite edges attached to form a tubular sleeve having top, side and bottom panels each with front and rear flaps, the rear flaps being folded into a common plane to close one end of the sleeve, and the front flaps being folded into the interior of the front end of the sleeve to engage one another, those front flaps attached to the side panels being additionally folded upon themselves at least once to form supporting pillars comprising at least two thicknesses of cardboard extending between the top and bottom panels in addition to the side panels. 
     
     
       2. A collapsible box file according to claim 1, wherein at least two of the rear flaps when folded extend the full height and width of the sleeve so as to support the top panel and to be supported by the bottom panel of the sleeve. 
     
     
       3. A collapsible box file according to claim 1, wherein said at least two flaps comprise those attached to the side panels, the rear flaps attached to the top and bottom panel being folded over one another overlying the side panel rear flaps and interlocked to maintain the rear of the sleeve in a closed condition. 
     
     
       4. A collapsible box according to claim 3, wherein said at least two flaps also include that one of the top and bottom panel rear flaps which underlies the other. 
     
     
       5. A collapsible box according to claim 1, wherein the front flaps on the top and bottom panels have tongues engaging slots in the folded front flaps of the side panels. 
     
     
       6. A collapsible box file according to claim 1, wherein the drawer has a base panel and front, rear and side panels, the front panel being of the same dimensions as the cross-section of the sleeve portion, and the rear and side panels being lower than the front panel. 
     
     
       7. A knocked down box file comprising a tubular sleeve having top, side and bottom panels and collapsed so that the top and one side panel overlie the other side and the bottom panel, front and rear flaps extending from each of the panels and connected thereto at fold lines, the front flaps on the side panels being the same height as the side panels and provided with further fold lines parallel to the fold lines connecting them to the side panels about which the flaps may be additionally folded upon themselves at least once, and the rear flaps on the side panels and one of the rear flaps on the top and bottom panels being of the same dimensions as the internal cross section of the sleeve when erected, the rear flaps on the top and bottom panels having configurations which are mutually interlockable when the sleeve is erected with the other of said rear flaps on the top and bottom panels overlying said one flap, and a blank erectable to form a drawer insertable in the sleeve when erected. 
     
     
       8. A knocked down box file according to claim 7, wherein the drawer blank has a drawer base panel, drawer side panels connected by fold lines to either side of the base panel, and front and rear end flaps connected by fold lines to the front and rear ends of the base and side panels, the front end flaps being foldable into interengagement to form a drawer front panel and the rear end flaps being foldable into interengagement to form a drawer rear panel, the front and rear flaps being configured so that the front panel formable by the front flaps is of the same dimensions as the sleeve when erected and the rear panel formable by the rear flaps is of lesser height than the front panel when erected.